Run mysql in a docker container

mysql_docker

docker container run `

-d `  # detach the container (run it in the background)

--name arkkkd ` # give the container a name (arkkkd)

-p 3306:3306 ` # set port mapping from your computer to the container (3306 to 3306)

# setting environment variables for mysql
--env MYSQL_ALLOW_EMPTY_PASSWORD=True ` 
--env MYSQL_DATABASE=arkkk `
--env MYSQL_USER=root `

# set the image to run the container from
mysql:8

This is clear. Thank you very much. I really do appreciate. I understand that an image was created and container generated. What I'm not clear about is where my database comes in the code. I.e my local database. I assume this is where its been set in docker ..

setting environment variables for mysql

--env MYSQL_ALLOW_EMPTY_PASSWORD=True --env MYSQL_DATABASE=arkkk
--env MYSQL_USER=root
Where arkkk is my database

If my assumption is true the I will like to know where the connection takes place with the image built for my springboot application.
I know how to create my dockfile in the application and I know how to generate my jar file already. All I want to know is the link that works btwn application and the local mysql db I.e arkkk